Radiological Findings of Aneurysmal Bone Cyst
摘要
Aneurysmal bone cyst (ABC) is a non-neoplastic osseous lesion which is composed of cystic cavities filled with blood. Twelve pathologically proven cases of primary ABC were collected in our hospital from 1982 to 1992. The patients ranged in age from 10 to 46 years (average 18.2 years). Of these 12 cases, 5 occurred in the femur, 2 each in the tibia and fibula, and 1 each in the humerus, pelvis and sacrum. Plain radiographic findings included well-defined osteolysis in all patients, trabeculation in 7, eccentricity in 8, expansion in 8 and periosteal buttressing in 5. Nine of the 10 cases in the long bones primarily affected the metaphysis and 5 of them crossed the epiphyseal plate. Five cases were examined with CT, which further showed fluid levels in 2 cases and cortical rims in 3. In the only case in which angiography was performed, hypervascularity and prominent stains were revealed. In conclusion, plain radiography plays an important role in the diagnosis of ABC, while CT and angiography can add weight to the diagnosis.